Traditional trochanteric sliding osteotomy preserves the lateral aspect of the greater trochanter, the abductors, and vastus lateralis in continuity. Our modification uses a lateral approach to the hip and osteotomy immediately anterior to the insertion of the posterior capsule and external rotators onto the greater trochanter. The osteotomy and attached abductors and vastus lateralis are translated anteriorly, leaving the posterior capsule and external rotators attached to the proximal femur. This surgical approach preserves the posterior soft-tissue stabilizing structures that resist posterior dislocation of the hip. In a retrospective review of 2 consecutive 2-year series of acetabular component revisions only between 1997 and 2001, 4 of 27 acetabular revisions using a traditional trochanteric slide subsequently dislocated; only 1 of 30 subsequent cases using a modified sliding trochanteric osteotomy dislocated. Modified sliding trochanteric osteotomy facilitated surgical exposure and produced a trend toward a lower dislocation rate that did not reach statistical significance with the small numbers of patients available.
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